<<Disclaimer: Verify this information before applying it to your situation.>> On that note - does anyone know the difference between IgA and IgG . The only thing it said on my blood exam blank is 'Anti-Gliadin serum levels' I have no clue if it's IgA or IgG, oh and for Jean, the range is also between 0 and 20 I think it's EU/mL - whatever that means. The problem is, I currently am in the Army, and I have the feeling, they are a bit primitive, in their views on Celiac diagnosis.